A phase shifter with a built-in transmission rod

Abstract

The invention discloses a phase shifter with a built-in transmission rod. The PCB is sandwiched between two dielectric sheets, and the three buckles of each dielectric sheet are inserted into the corresponding round holes of the built-in transmission rod through slight deformation. On the second rectangular groove, the cavity of the phase shifter is made of aluminum alloy extruded profile structure. The first limit protrusion structure in the cavity of the phase shifter is used to limit and guide the built-in transmission rod, optimizing the downtilt angle Accuracy, reducing the number of parts, saving assembly time, and reducing hidden dangers of intermodulation. The insulating layer of the coaxial cable passes through the bottom round hole of the semicircular groove, the inner conductor is lapped on the PCB pad for welding, and a round hole for welding process is opened on the wall of the phase shifter cavity directly above the PCB pad. For the welding pad, the outer conductor of the coaxial cable is directly welded on the semicircular groove outside the profile, which reduces the number of parts, saves assembly time, reduces the risk of solder joint damage, and reduces the hidden danger of intermodulation.

Description

Technical field [0001] The invention relates to the technical field of base station antennas for mobile communications, in particular to the field of phase shifters for base station antennas, and in particular to a phase shifter with a built-in transmission rod. Background technique [0002] In a wireless communication system, the base station antenna is the interface between the transceiver and the external propagation medium. With the development of wireless communication, the complex and changeable network environment and the shortage of site and steel structure communication tower platform resources, the requirements for base station antennas are usually higher. The use of electrically adjustable antennas can achieve continuous adjustment of the downward tilt angle of the vertical beam, making network coverage more flexible. The beam tilt angle of the electrically adjustable antenna can be changed by remote control as required, and the coverage effect is better than that of ...

AI Technical Summary

Problems solved by technology

[0004] Existing base station antenna design manufacturers: In the design of the dielectric sliding phase shifter, the transmission rod is placed outside the phase shifter cavity, which requires the design of the guide parts of the transmission rod and the connection between the dielectric sheet and the transmission rod components, which increases the difficulty of assembly; due to the cumulative tolerance of the assembly of the connecting parts, the difference between the displayed value of the downtilt angle scale and the actual downtilt angle is increased; because the transmission rod and the dielectric sheet are designed to be connected on one side, the dielectric sheet is in one direction. When moving in one direction, it is affected by tension, and when moving in the other direction, it is affected by thrust. When the dielectric sheet is subjected to thrust, the edge of the dielectric sheet will rub against the PCB, which will deteriorate the surface quality of the PCB and affect the third-order intermodulation performance of the phase shifter.

When welding the PCB and the coaxial cable, in order to ensure the continuity of the transmission line, the outer conductor of the coaxial cable and the welding block are welded first, and then the welding block is fastened to the cavity of the phase shifter by screws, and the welding block and the welding block are additionally added. Fasteners increase the difficulty of assembly while increasing the cost, and introduce new hidden dangers of third-order intermodulation

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